As a 12-year-old here, I'm glad I cannot imagine what you mean. But still, Katamari Damacy is one of the weirdest, but most addictive games ever. As of today, more that 3 years of not playing it, i'm straining to not break into song...

Lately I have been playing Antichamber. I cannot even begin to describe how mind-warping this game is. The entire concept revolves around impossible spaces, and particularly spaces that like to change depending on how you look at them. Combined with bizarre block puzzles and trippy artistic design, the result is something akin to what must happen if you chugged two Pan Galactic Gargle Blasters.